ABSTRACT These studies were conducted at the selected experimental area under wheat and rice cultivation in five fields in Al-Mahala El-Koubra district at El-Gharbia governorate, Egypt (30.9687°N 31.1665°E). In this work two Feddans were chosen, in some fields growing rice crop and wheat crop through two agriculture seasons during between November to September during 2018-2020. The common rodent species in the study area for the rice and wheat crops were the Norway rat, Rattus norvegicus Berk., [( 221 individuals and percentage 74.41% in 2019) and (294 individuals and percentage 78.82% in 2020)] and clamp rat  Rattus rattus (Linn.), [( 76 individuals and percentage 22.59% in 2019) and (79 individuals and percentage 21.81% in 2020)] during the two seasons in rice and wheat  field crops respectively. Estimate the loss caused by rodents in some economic crops (rice and wheat crops). The damage assessment technique caused by the Norway rat, Rattus norvegicus Berk., and Rattus rattus (Linn.), was caught from rice fields (as summer crop) and wheat fields (as winter crop).  No significant differences between experimental fields except field number 3. The second field recorded the highest mean infection 5.3% (6.6 ± 1.16) while the fourth field recorded the lowest mean infection 4.3% (5.1 ± 0.98) while no significant differences between experimental fields except field number 5. The fourth field recorded the highest mean infection 8% (7.9 ± 0.49) while the third field recorded the lowest mean infection 6.7% (7.3 ± 0.52) in rice crops. No significant differences between the fields of 2,4 and 5. The percentage of loss in the fields of 2,4 and 5 during  the dough stage were recoded 4.7%, 7.8%  and 8.8%. while in the mature stage were recorded 9.4%,11.0% and 10.7% respectively. In the second season, there was no significant difference between the fields 2,4 and 5 compared to the dough stage and the maturity stage, and the percentage loss in the dough stage was 8.5%, 8.8% and 7.8% respectively, while in the maturity phase it was 12.1%, 10.7 % and 9.2 respectively in wheat crops.